[Obsidian Dragon]

Looks like a nice setup. My first suspect is the Firewire card. You are using a PCIexpress model that may be too advanced (FireWire SIIG 800 3-Port PCIexpress (NN-E38012-S2). You might try a simple Digidesign approved PCI firewire card.

Secondly, I notice you have only one hard drive. If you are planning to use Protools, it is recommended to record to a physically separate hard drive (not a partition). I realize that the drive you're gettins is a fast 10,000 RPM SATA drive, but it still may not be able to handle the demands of both the operating system and streaming multitrack digital audio from the same drive. Make sure you get another hard drive for Protools audio.